[Blocks] Scaffolding react-fetch + first pass at node implementation (facebook#18863)

* First pass at scaffolding out the Node implementation of react-data.

While incomplete, this patch contains some changes to the react-data
package in order to start adding support for Node.

The first part of this change accounts for splitting react-data/fetch
into two discrete entries, adding (and defaulting to) the Node
implementation.

The second part is sketching out a rough approximation of `fetch` for
Node. This implementation is not complete by any means, but provides a
starting point.

* Remove NodeFetch module and put it directly into ReactDataFetchNode.

* Replaced react-data with react-fetch.

This patch shuffles around some of the scaffolding that was in
react-data in favor of react-fetch. It also removes the additional
"fetch" package in favor of something flatter.

* Tweak package organization

* Simplify and add a test

Co-authored-by: Dan Abramov <dan.abramov@me.com>

Author: maisano

fixtures/blocks/src/server/Comments.js

@@ -7,7 +7,7 @@
 /* eslint-disable import/first */
 
 import * as React from 'react';
-import {fetch} from 'react-data/fetch';
+import {fetch} from 'react-fetch';
 
 // TODO: Replace with asset reference.
 import Link from '../client/Link';

fixtures/blocks/src/server/Feed.js

@@ -7,7 +7,7 @@
 /* eslint-disable import/first */
 
 import * as React from 'react';
-import {fetch} from 'react-data/fetch';
+import {fetch} from 'react-fetch';
 import PostList from './PostList';
 
 export default function Feed() {

fixtures/blocks/src/server/PostList.js

@@ -8,7 +8,7 @@
 
 import * as React from 'react';
 import {Suspense, unstable_SuspenseList as SuspenseList} from 'react';
-import {preload} from 'react-data/fetch';
+import {preload} from 'react-fetch';
 import PostGlimmer from './PostGlimmer';
 import Post from './Post';
 

fixtures/blocks/src/server/ProfileBio.js

@@ -7,7 +7,7 @@
 /* eslint-disable import/first */
 
 import * as React from 'react';
-import {fetch} from 'react-data/fetch';
+import {fetch} from 'react-fetch';
 
 export default function ProfileBio({userId}) {
   const user = fetch(`/users/${userId}`).json();

fixtures/blocks/src/server/ProfilePage.js

@@ -7,7 +7,7 @@
 
 import * as React from 'react';
 import {Suspense} from 'react';
-import {fetch} from 'react-data/fetch';
+import {fetch} from 'react-fetch';
 import {matchRoute} from './ServerRouter';
 import ProfileTimeline from './ProfileTimeline';
 import ProfileBio from './ProfileBio';

fixtures/blocks/src/server/ProfileTimeline.js

@@ -7,7 +7,7 @@
 /* eslint-disable import/first */
 
 import * as React from 'react';
-import {fetch} from 'react-data/fetch';
+import {fetch} from 'react-fetch';
 import PostList from './PostList';
 
 export default function ProfileTimeline({userId}) {

packages/react-data/npm/fetch.js

@@ -1,4 +1,4 @@
-# react-data
+# react-fetch
 
 This package is meant to be used alongside yet-to-be-released, experimental React features. It's unlikely to be useful in any other context.